38581 has 4 divisors (see below), whose sum is σ = 39564. Its totient is φ = 37600.

The previous prime is 38569. The next prime is 38593. The reversal of 38581 is 18583.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (38569) and next prime (38593).

It can be written as a sum of positive squares in 2 ways, for example, as 11025 + 27556 = 105^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 38581 - 2⁷ = 38453 is a prime.

It is a super-2 number, since 2×38581² = 2976987122, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

38581 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430 + ... + 511.

It is an arithmetic number, because the mean of its divisors is an integer number (9891).

2³⁸⁵⁸¹ is an apocalyptic number.

It is an amenable number.

38581 is a deficient number, since it is larger than the sum of its proper divisors (983).

38581 is an equidigital number, since it uses as much as digits as its factorization.

38581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982.

The product of its digits is 960, while the sum is 25.

The square root of 38581 is about 196.4204673653. The cubic root of 38581 is about 33.7902309454.

The spelling of 38581 in words is "thirty-eight thousand, five hundred eighty-one".